CVE-2026-64304 (GCVE-0-2026-64304)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-10-19 20:38
VLAI
Title
crypto: qat - validate RSA CRT component lengths
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: qat - validate RSA CRT component lengths The generic RSA key parser (rsa_helper.c) bounds each CRT component (p, q, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt() allocates half-size DMA buffers (key_sz / 2) and right-aligns each component with: memcpy(dst + half_key_sz - len, src, len) When a CRT component is larger than half_key_sz the subtraction underflows and memcpy writes past the DMA buffer, causing memory corruption. Add a len > half_key_sz check next to the existing !len check for each of the five CRT components so the driver falls back to the non-CRT path instead of writing out of bounds.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:38 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 879f77e9071f029e1c9bd5a75814ecf51370f846 , < 6d99c5fadd2df488103f64d6475b63ba6852202b (git)
Affected: 879f77e9071f029e1c9bd5a75814ecf51370f846 , < c34369473bfe92a0b46ec78d6358e30341c7f481 (git)
Affected: 879f77e9071f029e1c9bd5a75814ecf51370f846 , < 1002719d13072a5e4be1e993aa61dffb4a604e82 (git)
Affected: 879f77e9071f029e1c9bd5a75814ecf51370f846 , < 500319830d76911c120dc0b9605f8c16d7702844 (git)
Affected: 879f77e9071f029e1c9bd5a75814ecf51370f846 , < 3d61a214fdcda41f1ebfabbb483404032a7b4d91 (git)
Affected: 879f77e9071f029e1c9bd5a75814ecf51370f846 , < 6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a (git)
Affected: 879f77e9071f029e1c9bd5a75814ecf51370f846 , < ce42224487c504aee4b7ff3a7342e7b4d7e28cc9 (git)
Affected: 879f77e9071f029e1c9bd5a75814ecf51370f846 , < b3ac78756588059729b9195fcc9f4b37d54057a5 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: qat - validate RSA CRT component lengths\n\nThe generic RSA key parser (rsa_helper.c) bounds each CRT component (p,\nq, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt()\nallocates half-size DMA buffers (key_sz / 2) and right-aligns each\ncomponent with:\n\n    memcpy(dst + half_key_sz - len, src, len)\n\nWhen a CRT component is larger than half_key_sz the subtraction\nunderflows and memcpy writes past the DMA buffer, causing memory\ncorruption.\n\nAdd a len \u003e half_key_sz check next to the existing !len check for each\nof the five CRT components so the driver falls back to the non-CRT path\ninstead of writing out of bounds."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: qat - validar las longitudes de los componentes RSA CRT\n\nEl analizador gen\u00e9rico de claves RSA (rsa_helper.c) limita cada componente CRT (p, q, dp, dq, qinv) por el tama\u00f1o del m\u00f3dulo n_sz, pero qat_rsa_setkey_crt() asigna b\u00faferes DMA de tama\u00f1o medio (key_sz / 2) y alinea a la derecha cada componente con:\n\n    memcpy(dst + half_key_sz - len, src, len)\n\nCuando un componente CRT es mayor que half_key_sz, la resta subdesborda y memcpy escribe m\u00e1s all\u00e1 del b\u00fafer DMA, causando corrupci\u00f3n de memoria.\n\nA\u00f1adir una comprobaci\u00f3n len \u003e half_key_sz junto a la comprobaci\u00f3n !len existente para cada uno de los cinco componentes CRT para que el controlador recurra a la ruta no-CRT en lugar de escribir fuera de los l\u00edmites."
          }
        ],
        "id": "CVE-2026-64304",
        "lastModified": "2026-10-24T13:10:00.147",
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        "vulnStatus": "Modified",
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                "lang": "en",
                "value": "CWE-787"
              }
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            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
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                "value": "CWE-787"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
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        ]
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    },
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      "current_release_date": "2026-09-16T05:32:33+00:00",
      "cve": "CVE-2026-64304",
      "id": "CVE-2026-64304",
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      "product_status:fixed": "1658",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: qat - validate RSA CRT component lengths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64304.json",
      "version": "3"
    },
    "vulnrichment": {
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                  "content": {
                    "id": "CVE-2026-64304",
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                      },
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            "problemTypes": [
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                    "cweId": "CWE-787",
                    "description": "CWE-787 Out-of-bounds Write",
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                    "type": "CWE"
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              }
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              "dateUpdated": "2026-10-16T15:38:48.471Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
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            "title": "CISA ADP Vulnrichment"
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        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              "vendor": "Linux",
              "versions": [
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: qat - validate RSA CRT component lengths\n\nThe generic RSA key parser (rsa_helper.c) bounds each CRT component (p,\nq, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt()\nallocates half-size DMA buffers (key_sz / 2) and right-aligns each\ncomponent with:\n\n    memcpy(dst + half_key_sz - len, src, len)\n\nWhen a CRT component is larger than half_key_sz the subtraction\nunderflows and memcpy writes past the DMA buffer, causing memory\ncorruption.\n\nAdd a len \u003e half_key_sz check next to the existing !len check for each\nof the five CRT components so the driver falls back to the non-CRT path\ninstead of writing out of bounds."
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                  "value": "AV:L - An unprivileged local process can add a crafted PKCS#8 RSA private key to its own keyring and invoke KEYCTL_PKEY_QUERY, which selects qat-rsa and reaches the vulnerable key setup path.\nAC:L - With an active QAT asymmetric service and PKCS#8 parser, an oversized CRT integer deterministically causes unsigned offset underflow and an out-of-bounds memcpy. No race or attacker-uncontrollable condition is required.\nPR:L - An ordinary user can create, search, and use keys in a personal process, thread, or session keyring. No capability, administrator privilege, or user namespace is required.\nUI:N - The attacker directly performs the add_key and keyctl system calls without any victim action.\nS:U - The vulnerable QAT driver and the corrupted kernel resources share the same security authority. Ordinary kernel privilege escalation does not cross a CVSS scope boundary.\nC:H - The controlled kernel-memory overwrite can corrupt page tables, credentials, or control-flow objects and plausibly yield code execution with access to protected kernel memory.\nI:H - Attacker-controlled CRT bytes are written outside the coherent DMA allocation, potentially through multiple CRT components. This can provide powerful kernel-memory corruption and control-flow hijacking primitives.\nA:H - The invalid destination can cause an immediate kernel fault or corrupt unrelated kernel memory and subsequently panic or hang the system. The attack is repeatable."
                }
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        "dateReserved": "2026-07-19T15:36:31.779Z",
        "dateUpdated": "2026-10-19T20:38:22.981Z",
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}



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